Friction shock absorbing mechanism



Jan. 22, 1946. a. E. DATH v 'FRICTiON SHOCK ABSORBING' MECHANISM Filed Nov. 17, 1941 2 Sheets-Sheet 1 lllllllul llll 28 fizz/alto)" gwwfge W fit-2y Jan. 22, 1946.

G. E DATH FRICTION LSHOCK ABSORBING MECHANISM Filed Nov. '17. 1941 2 Shee ts-Sheet 2 1. a 3 a a am;

lllclllv GeorgeEDat/L Patented Jan. 22, 1946 '2 ,393,29;7; Eateries,sttgqigen tnmeMummers.

George Bath; Mokena, Illa, assignor. to. *Minen lnm, Chicago; IlL, acorporation of; Del-;

One objectof the invention is to provideina mechanism of the character indicated in the preceding paragraph. a spring cap whieh is re'edi y i end. my as ta d, wherein the cap is held anchoredto the casing fih qi l'if the pressure; exerted .b the spring re-. sen e 'A mor Specific object of the; invention is toproyid euin a. device. of the charactenset forthin h preced ne arag a asp' i ie n-Com d: of two sections to facilitate asseniblingiwiththe cas ipg, wherein the sections. have shouldered engagement, with the. casing to limit outward mevem n he we a t f h ame the casing andfwherein the cap .inclufilles locking v, .eans'jiorming' a part. of. they cap and held; in locking engagement with the sections thereof;

assemb ed tb ether d fine. as i re pl te i e. bet.

by the action of the spring resistance. offlthe' mechanism to. rigidl join. the. parts of the'cap tqggther. I

Qtherobieetee the. v i n. w l m e c r y anne l f em he de ri i n m' e m lh rei eitegni l w e I In the'd aw nee form ng a p t t is epecine wile ,j' f eure' deeleva i na V d 11 2?l n itud nelsv lt ieal sect 9 a vi wef a. f i ngehe kl eb qrle ne. mechanism i l t ating. my imgroyemer ts m connection therewith the .s'ec.- tion corresponding substantially to the line l.l. of Fig nre 2;. Figure 2 i s a real? 1 d. elevational. View of Figiire 1,,1'oohing in the direction of the IQW 1- F fl r is a V ew. 11mm o. E eu e 1 lus a g. the manner. '0: sem in hwart .etth mee e m- Eieur ie i part P 9 3} a d P r h riz ntal ongi u inal... sec al view-oi-the strncture shown in Figures 1 and 2, the section corresponding substantially to the.

' .19 it Figure Theffrictionshock absorbing mechanism comprises a friction easing [0' of substantially rec tangulartransverse gross section at theurear end poi n thereof, a, friction clutch; I l slidable with ee-t ste. an springs an It else-win movement of the' clutch. This mechanism thus 1 forminga, retaining lug o fl nseedep ed op n. d. Qthe. ca ing. H19. d finin t f escribed welbknewn. he nd, is.

V mil to the ,c eep ndine par ed. the ni eha g nism illustrated. in Patent, Ndi 2, 0 50., 54 1;, granted to R, J. ,o nde ugus 5 a ifigendthe. on t t e f S S mi e toj t t of t eQ neQhanism disclosed in this patent.

he wed e bloc e stheifrietiqri. cluteh is. h ld; assembled with the c'asingby shouldered. 1; agement. with an intu ie s p. fianeea the. open en f. sai sing. In. in. he same'mi nn as said Olandei' patent.

y mp qvements inv e .b esi x, t..-i1 g ,ev cap A at he. rear, nd. tt e casing, h. sheuld r d nsaee nt with t e LatterL Q rest Qt. utwa d movemen cf the. can and ancho he same to the casing, thei r ne apiew qm two imi ar c ns. 'B.'B, a p us C, and a. u

Th sectiens. B-B Oithe. cap A LmQfi' elm; des n, a'e com risin semi-ey indrical wa k. e=p on llprovidedfwith a la era ly put ta ga i g i base, enee, and. n; cut le al x intu d, arc-.s ePedflaneelIt, The b I .-,l.5. proper. of. I he i wQ s ctions t on f uar outline oijsl ehtw s ze than the square opening II at, the rear end; oi the casing. H1, as? clearly eh wninli' euree- 2;. A h dee'o'tj g at t ehethof the): the, flange. l5 of each section. Vis provi'd la e 'eutstanding or prqiectmei b port o of lesser thicknessthan thejflange, l6, s

ease in. basket the n med. flan e. 1:9 at we pening l1, The flate id iaeeett 0 each. ec ion B.has n;er.e=she ed.

0. t er i fe 'a-nu pese. h,e nai e tv described Qui s inner side; fa e he flange fin esmani arc-shaped roove t. here pede te tphcoe operatewith n a in eans on, thenlugC naft r. described. The ro m 20 lll assembleci jformi efifi cOmPl. l'q lflfi glow/BS, The o nin be en he. ames its-AB; is s stantially. rcula as. indicated at.-,2.

hep ug 0 om ris s acircuht ee i egbase. portion 23 having anoutstanding; cylindriqal er largement or bOSs; 24, thereon .whiehis of;. lesse diameter than thebase Z3 and: conce there-.8 with. Ihe.cylindricalenlargement 2 4 is 0-a s e to fit. the opening-22 between the flange with slightciearance. At its periphery th e selthesa ann ar q tstendm "2.5; whiehis. edemedTtenge e e ide ee .--2Jt of the flanges 16-46 of the sectiofisB-B; The

2 v disclike portion 23 is, in effect, a flange. The plug C fits within the sections BB with the disclike portionfitting the inner sides of the walls I I-14 of the sections BB and the boss 24 fitting within the opening 22 between the flanges I6I6 and having its outer face 26 flush with the outer end faces 2'I2I of the sections BB, as clearly shown in Figures 1 and 4.

The ring D has a flat inner side 28 forming an abutment for the'spring I2. The opening of the ring, which is indicated by 29, is of lesser diameter than the largest diameter of the plug C but is of sufiicient size to freely accommodate the inner v coil I3 of the spring resistance. The outer periphery of the ring is of substantially oval contour, having curved side portions 3030 concentric to the opening 29 as seen most' clearly in Figure 2, merging with tangential side edges 3I3I at the top and bottom, as shown in said figure, and terminating in top and bottom projections 32-32 which overlap the flanges I9-IQ of the casing at the inner sides of said flanges. At

their extremities the projections 3232 have arcshaped ribs 3333 adapted to engage the flanges I9 -I8 of the casing. The ribs 3333 embrace the peripheral edge of the base portions or flanges I5--I5 of the two sections BB in overlapping relation to the adjacent ends of said flanges. Inwardly of the ribs 33-33 and concentric therewith, the ring D has on the side thereof facing the sections BB an annular outstanding rib 34 adapted to engage within the grooves 2020 of the flanges I5I5. As shown most clearly in Figures 1, 3, and 4, the ribs 38 of the casing I are cut away at the rear of the casing, thereby providing the casing with an interiorly smooth portion 35 within which the ring is guided. The outline of the ring D, as will be seen in Figure 2, is of such a shape that when it is rotated through an arc of 45 from the position shown in said fi ure to bring the projections in line with the two diagonally opposite corners of the casing, the ring will pass freely through the opening I! at the rear end of the casing to permit insertion of the ring into the casing and removal therefrom.

In assembling the mechanism the friction clutch II and the springs I2 and I3 are first placed within the casing ID by inserting the'same through the opening I! at the rear end of the casing. The ring D is then inserted through the opening II, the ring having first been rotated to a position at 45 from that shown in Figure 2 in which position the same will pass freely through said opening, the extended or projected portions 3232 of the ring being thus disposed at diagonally opposite corners of the opening. The plug C is then passed through the opening I! and brought into abutment with the ring and forced inwardly to the position shown in Figure 3 by a tool such as a bar or plunger 31 while the casing is buttressed against a block in the formv of a ring 36, shown in dotted lines in said'figure. In this connection it is pointed out that the ring 36 is of greater thicknessthan the projection of the wedge of the clutch I I, thereby preventing the clutch from being forced inwardly during the assembling operation, so that the springs I2 and I3 are compressed only due to inward displacement of the ring D and the plug C: The two sections BB of the cap A are then applied while in slightly tilted position so that the flanges II5 of the same will pass freely between and clear the flanges I9 of the casing. .'Af ter the cap A has been pushed inwardly to an extent that the flanges' I5--I5 thereof aredispos'ecl inwardly of the flanges I9 of the casing, th sec'- tions BB of the cap are rocked back to normal position, that is, to the position wherein the flanges I5-I5 of the cap lie in a common transverse plane, thus bringing the flanges I5I 5 into overlying relation to the flanges I9 of the easing. The tool 31 is then withdrawn permitting the springs I2 and I3 to expand, thus forcing the ring D and plug C outwardly against the sections BB of the cap and engaging the ribs 34 of the ring D within the grooves 2Il20 of the flanges I5I5 and the rib 25 of the plug within the grooves 2I2I of the flanges I6I6 of the sections BB, and forcing the lugs I8-I8 of the flanges of the sections BB against the retaining flanges I9 of the casing. The parts of the cap A are thus locked together as a unit, the irmer spring I3 which extends through the opening of the ring D holding the plug C seated and the outer spring coil I2 which bears on the ring D holding the latter seated. In this connection it is pointed out that the interengaging ribs and grooves on the ring D, plug C; and sections BB of the cap hold both of these sections of the cap against tilting when an eccentric load is applied to the cap, thus preventing accidental displacement of these sections with respect to the retaining flanges I9 of the casing to an extent which might result in disengagement of the parts.

When the mechanism has been completely assembled, outward movement of the cap is limited by engagement of the flange portions I5I8 thereof with the retaining flanges I9 of the casing. v

The spring cap A may be readily removed when for any reason it is found desirable to take the gear apart, the plug C and the ring D bein forced inwardly by the tool 31 engaged through the opening of the sections BB of the cap until there is sufiicient clearance to permit the sections BB to be tilted to an extent to disengage the flanges thereof from the retaining flanges of the casing.

I have herein shown and described what I now consider the preferred manner of carrying out my invention, but the same is merel illustrative and I contemplate all changes and modifications that come within the scope of the claims appended hereto.

I claim:

1. In a shock absorbing mechanism, the combination with a casing having an open end provided with inturned stop flanges at said open end; of a spring cap slidable' within said casing, said cap including a transversely split cup-shaped element comprising two like sections, said element extending through'said open end and outwardly thereof, the sections of said split element respectively having flanges in shouldered engagement with the stop flanges to limit outward movement of said element, and a plugengaged within said cup-shaped split element, the flanges of said cup-shaped element being displaced toward each other when said sections are tilted one with respect to the other, whereby said flanged end of the cap is contractible to. pass freely'between the stop flanges of the casing to permit insertion of the flanged end of said cap.

through said open end of the casingin assembling the mechanism, said plug inter-fitting with said cap to holdthe sections thereof against relative tilting when the mechanism is completely assembled; and spring means within the casing yieldingly opposing inward movement of said cap including a spring element yieldingly holding said plug engaged with said cup-shaped element. v 2. In a shock absorbing mechanism, the combination with a casing having an open end provided with interior stop shoulders at said open end; of a spring cap comprising a transversely splitsectional cuplike member composed of two like sections having shouldered engagement at the inner end of said cap with said stop shoulders, a, plug seated in said cuplike member, and a ring bearing on the inner end of the sections of the cuplike member, said sections of the cuplike memher and ring having interlocking grooves and ribs, and said plug and cap sections having interlocking grooves and ribs, the shouldered inner end portion of said cap being contracted when said sections are tilted one with respect :to the other to permit said inner end of the cap to pass freely between the stop shoulders of the casing to permit insertion of said end of the cap through the open end of the casing in assembling the mechanism; a central spring element within the casing extending through the ring and hear. ing on said plug; and a spring surrounding said central spring and bearing on said ring,

GEORGE E. DATH. 

